Question 1

A researcher has data on viewers' responses regarding what company sponsored the Super Bowl half-time show for the past two years and has coded it "1" if the response was correct and "0" if not. He would like to examine if there is a statistical difference in correct answers between the two years. Explain what statistical test is appropriate to address this research question.

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Question 2

Discuss the factors that influence the statistical choice. If a researcher is examining factors that influence an automobile's gas mileage, which statistical tool (or tools) is appropriate?

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Question 3

_____ is the appropriate statistical tool to use when comparing the means of three or more groups to see if they are significantly different from one another.

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Question 4

What is ANOVA and when is it the appropriate statistical technique? What test is used to determine significance? Give an example of a research question that can be analyzed using ANOVA.

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Question 5

The _____ is the mean of a variable over all observations.

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Question 6

The _____ for differences of proportions is a technique used to test the hypothesis that proportions are significantly different for two independent samples or groups.

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Question 7

The sum of differences between the group mean and the grand mean summed over all groups for a given set of observations is called _____ variance.

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Question 8

An appropriate test for comparing the scores of two interval variables drawn from related populations is the _____.

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Question 9

One way to interpret the meaning of the results of the t-test is to focus on the ________ and the group means.

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Question 10

List the practical steps for interpreting t-test results.

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Question 11

In using the t-test to compare the difference between the means of two groups, the formula for determining the degrees of freedom is ______.

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Question 12

Discuss when a paired-samples t-test is appropriate and give an example of when it should be used.

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Question 13

Explain what an independent samples t-test is and the null hypothesis examine.

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Question 14

The _____ is an estimate of the standard error for a t-test of independent means that assumes the variances of both groups are equal.

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Question 15

Explain what a Z-test for comparing two proportions is and the appropriate hypothesis.

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Question 16

The statistical test for an ANOVA model is the ______.

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Question 17

The F-test partitions total variance into ______ variance and ______ variance.

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Quiz 22: Bivariate Statistical Analysis: Differences Between Two Variables